The Xiaomi Redmi 9 Prime was officially released on August 4, 2020
The smartphone is equipped with sensors such as a fingerprint sensor (rear-mounted), accelerometer, proximity, and compass. The smartphone features an Infrared port, USB 2.0, Type-C 1.0 reversible connector, USB On-The-Go, and Bluetooth 5.0.
go near some mi service centers and you can complain that ,why your earphone jack (3.5mm jack) is not working and then if you have to do it urself then clean it with high pressure air . through the small holes..